Sigil of Piercing Strength

Sigil of Piercing Strength is a Accent Sigil in Tyranny.

Description
Accent that increases a spell's Armor Penetration.

Location
This sigil series is unusual as the more powerful variants are only available with Spire upgrades.
 * (Level II) Training grounds: In a box on the left side.
 * (Level III) Library: Sold by Eirena.